const crypto = require('crypto');const util = require('util');class AES {    constructor(key, iv) {        if (!key) throw new Error('A 32 byte / 256 bit key is required.');        if (!iv) throw new Error('Initialization vector is required.');        this.key = key;        this.iv = iv;    }    encrypt(data) {        let cipher = crypto.createCipheriv('aes-256-cbc', this.key, this.iv);        let encrypted = cipher.update(data, 'utf-8', 'hex');        encrypted += cipher.final('hex');        return encrypted;    }    decrypt(data) {        let decipher = crypto.createDecipheriv('aes-256-cbc', this.key, this.iv);        let decrypted = decipher.update(data, 'hex', 'utf-8');        decrypted += decipher.final('utf-8');        return decrypted;    }    static randomBytes = async bytes => {        let result;        result = await util.promisify(crypto.randomBytes)(bytes);        return result;    }    sha256(data) {        return crypto.createHash('sha256').update(data).digest('hex');    }}以上是我的代碼，我想知道加密和解密方法是否應該異步？使用我的測試數據執行時間不到 1 毫秒，但是如果有成千上萬的并發用戶，使用異步構建這些方法會更好嗎？我無法在早期的測試中承諾它們，所以我想也許模塊不能異步？